Abstract
A mineral name has never been more appropriately selected than that of apatite, which is from áπaτáω (I deceive). Nor has this deception been limited to elementary students: indeed, the variability of the properties and modes of occurrence of the members of the apatite group are so great as to have resulted in the failure to refer certain of them to the apatite group even since the beginning of the twentieth century. In other studies the manner of substitution of some of the ions, commonly present, has been poorly understood or wholly misunderstood.
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